When talking about how the group has lost their "scapegoat," Pierce, Abed says "We've lost our Cliff Clavin. Our George Costanza. Our Turtle. Or Johnny Drama. Or E." Cliff Clavin was a character on Cheers (1982) George Costanza was from Seinfeld (1989), and Turtle, Johnny Drama, and E were all from Entourage (2004) hence Abed's comment "Man, that show is sloppy."
Lisa Rinna guest stars in this episode and Jeff says something about her being on the reality show "Real Housewives". She is now on The Real Housewives of Beverly Hills (2010), although she wasn't when the episode aired.
The fraternity that Troy and Abed pledge is Omega-Theta-Rho, O-Th-R, or other.
In this episode, Chang steals cookies from the "Brown Birds," a fictional version of the Girl Scouts. The fictional "Brown Birds" first appeared in Friends, Season 3, episode 10, (The One Where Rachel Quits) when Ross injures a Brown Bird (Mae Whitman) and then sells cookies for her.
The pizza delivery guy in the credits scene is played by Aaron Hill from the show Greek. He played Beaver, an affable brother from the hardest-partying fraternity in the show.